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Full text of "The manufacture and properties of iron and steel"

METHODS OF MANUFACTURE.
237
TABLE XII-L Silica in the Talbot Furnace.
		BIO, Per cent.	81O. Pounds.
Scale ...... . ................	22 400	0 50	119
Ore ..................... .....	15 100	3 00	453
Cinder.... ................	13 800	8 00	1 1(U
Manganese ore ..............	2500	IK dft\	lOCfti
Limestone ...................	23*240	a 00^	/oao\
Prom roof and walla <est.). . .			(50)
			urn
From oxidation of silicon, . .	1		2,636
			
Total ......................			4 827
			
Thus 14,708 pounds of oxygen are necessary to burn the metalloids, while 12,840 pounds of available oxygen have been added in the ore and limestone. This leaves 1868 pounds to be supplied by the flame. The amount of oxygen theoretically necessary agrees closely with the amount added and available, the discrepancy being less than 13 per cent.; the figure given for Steelton agreed within 12 per cent.
TABLE XII-J. Oxygen in the Talbot Furnace.
Element.	Per cent.	Pounds present.	Oxygen needed, pounds.
Si C P Ma	0.58 3.75 0 85 0.60	1,230 7,954 1.803 1,273	1,406 = 2,636 Ibs. SIO, 10,605 = 18,559 Ibs. CO 2,327 = 4,130 Ibs. P.O. 370 = 1,643 Ibs. MnO
	5.78		14708
			
In the case of the Bertrand Thiel process, the difference was about 16 per cent., but allowance was not made for the oxidizing effect of the limestone.
Thus these calculations are not all guesswork and often there can be found corroborative testimony. For instance, Mr. Talbot gives the composition of the final slags in the furnace at the end of five different weeks. The average shows 39.07 per cent. CaO, the minimum 37.65 per cent, and the maximum 40.69 per cent. The